Mailing List flyrotary@lancaironline.net Message #24135
From: Gary Palmer <gpalmer@rogers.com>
Subject: Re: [FlyRotary] Re: FW: Do Not Use Auto Brake Fluid
Date: Sat, 18 Jun 2005 23:05:19 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Why not use a good hydraulic ATF fluid such as Dexron III which has a flash point of 400 F, and is readily available. See url:
http://www.pzlqs.com/Tech/Pdsheet/DomesticMarketing/Gear&Transmission/pdf/DexronIIIMerconAutomaticTransmissionFluid.pdf

Cheers...........Gary

Ian Dewhirst wrote:

Thanks Ed,

I have been following the discussion and your post prompted me to see what
aircraft brake fluid was all about.  For those who haven't bothered to
google this, Mil-H-5606 is a mineral based hydraulic oil (unlike brake fluid
which is glycol or silicone based) with a flashpoint of 284 degrees
Fahrenheit.  Hmmm, no wonder people have brake fires.  The up side is it is
pretty much the same price as DOT-X.

Anybody have an idea why hydraulic oil is chosen?  I know hydraulic oil is
used in heavy equipment to apply the brakes, I think the simple reason in
that application is that there is a lot of it pressurized and available. I
trust that is not the reason it is used in a C172? -- Ian

P.S. Good Luck Ed!

Do NOT use automotive brake fluid in aircraft brake systems.  Incompatible
with the seal materials.  See information at
http://www.groveaircraft.com/brake_info.html

Ed A



 

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Gary Palmer
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Gary Palmer
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Lancair 235 C-GPLM President EAA chapter 245, Ottawa, Ontario
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